Mercurial > hg > toybox
annotate toys/netcat.c @ 389:5e9c1d73c84a
Implement nohup.
author | Rob Landley <rob@landley.net> |
---|---|
date | Sun, 20 Nov 2011 21:13:47 -0600 |
parents | 48e0f1f45181 |
children | d44eb064da41 |
rev | line source |
---|---|
233
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
1 /* vi: set sw=4 ts=4: |
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
2 * |
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
3 * nc: mini-netcat - Forward stdin/stdout to a file or network connection. |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
4 * |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
5 * Copyright 2007 Rob Landley <rob@landley.net> |
194
30a6db5a95c2
Add comments about SUSv3 specs (or lack thereof).
Rob Landley <rob@landley.net>
parents:
189
diff
changeset
|
6 * |
30a6db5a95c2
Add comments about SUSv3 specs (or lack thereof).
Rob Landley <rob@landley.net>
parents:
189
diff
changeset
|
7 * Not in SUSv3. |
233
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
8 |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
9 USE_NETCAT(OLDTOY(nc, netcat, USE_NETCAT_LISTEN("tl^L^")"w#p#s:q#f:", TOYFLAG_BIN)) |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
10 USE_NETCAT(NEWTOY(netcat, USE_NETCAT_LISTEN("tl^L^")"w#p#s:q#f:", TOYFLAG_BIN)) |
234
163498bf547b
Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
Rob Landley <rob@landley.net>
parents:
233
diff
changeset
|
11 |
233
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
12 config NETCAT |
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
13 bool "netcat" |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
14 default y |
233
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
15 help |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
16 usage: netcat [-wpq #] [-s addr] {IPADDR PORTNUM|-f FILENAME|-let} [-e COMMAND] |
233
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
17 |
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
18 -w SECONDS timeout for connection |
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
19 -p local port number |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
20 -s local ipv4 address |
233
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
21 -q SECONDS quit this many seconds after EOF on stdin. |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
22 -f use FILENAME (ala /dev/ttyS0) instead of network |
233
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
23 |
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
24 Use "stty 115200 -F /dev/ttyS0 && stty raw -echo -ctlecho" with |
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
25 netcat -f to connect to a serial port. |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
26 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
27 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
28 config NETCAT_LISTEN |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
29 bool "netcat sever options (-let)" |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
30 default y |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
31 depends on NETCAT |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
32 help |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
33 -t allocate tty (must come before -l or -L) |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
34 -l listen for one incoming connection. |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
35 -L listen for multiple incoming connections (server mode). |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
36 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
37 Any additional command line arguments after -l or -L are executed |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
38 to handle each incoming connection. If none, the connection is |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
39 forwarded to stdin/stdout. |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
40 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
41 For a quick-and-dirty server, try something like: |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
42 netcat -s 127.0.0.1 -p 1234 -tL /bin/bash -l |
233
d4176f3f3835
Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents:
194
diff
changeset
|
43 */ |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
44 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
45 #include "toys.h" |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
46 #include "toynet.h" |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
47 |
237
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
48 DEFINE_GLOBALS( |
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
49 char *filename; // -f read from filename instead of network |
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
50 long quit_delay; // -q Exit after EOF from stdin after # seconds. |
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
51 char *source_address; // -s Bind to a specific source address. |
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
52 long port; // -p Bind to a specific source port. |
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
53 long wait; // -w Wait # seconds for a connection. |
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
54 ) |
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
55 |
7cb15eae1664
Zap toylist.h, moving contents of global structures into DEFINE_GLOBALS()
Rob Landley <rob@landley.net>
parents:
234
diff
changeset
|
56 #define TT this.netcat |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
57 |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
58 #define FLAG_f 1 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
59 #define FLAG_L 32 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
60 #define FLAG_l 64 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
61 #define FLAG_t 128 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
62 |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
63 static void timeout(int signum) |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
64 { |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
65 if (TT.wait) error_exit("Timeout"); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
66 exit(0); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
67 } |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
68 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
69 static void set_alarm(int seconds) |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
70 { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
71 signal(SIGALRM, seconds ? timeout : SIG_DFL); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
72 alarm(seconds); |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
73 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
74 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
75 // Translate x.x.x.x numeric IPv4 address, or else DNS lookup an IPv4 name. |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
76 static void lookup_name(char *name, uint32_t *result) |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
77 { |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
78 struct hostent *hostbyname; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
79 |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
80 hostbyname = gethostbyname(name); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
81 if (!hostbyname) error_exit("no host '%s'", name); |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
82 *result = *(uint32_t *)*hostbyname->h_addr_list; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
83 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
84 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
85 // Worry about a fancy lookup later. |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
86 static void lookup_port(char *str, uint16_t *port) |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
87 { |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
88 *port = SWAP_BE16(atoi(str)); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
89 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
90 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
91 void netcat_main(void) |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
92 { |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
93 int sockfd=-1, pollcount=2; |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
94 struct pollfd pollfds[2]; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
95 |
324
50c8afc263ee
More than 4k of input can be queued up in a pipe, so loop needs to continue reading until POLLIN is exhausted before acknowledging POLLHUP.
Rob Landley <rob@landley.net>
parents:
323
diff
changeset
|
96 memset(pollfds, 0, 2*sizeof(struct pollfd)); |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
97 pollfds[0].events = pollfds[1].events = POLLIN; |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
98 set_alarm(TT.wait); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
99 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
100 // The argument parsing logic can't make "<2" conditional on other |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
101 // arguments like -f and -l, so we do it by hand here. |
328 | 102 if (toys.optflags&FLAG_f) { |
103 if (toys.optc) toys.exithelp++; | |
104 } else if (!(toys.optflags&(FLAG_l|FLAG_L)) && toys.optc!=2) toys.exithelp++; | |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
105 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
106 if (toys.exithelp) error_exit("Argument count wrong"); |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
107 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
108 if (TT.filename) pollfds[0].fd = xopen(TT.filename, O_RDWR); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
109 else { |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
110 int temp; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
111 struct sockaddr_in address; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
112 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
113 // Setup socket |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
114 sockfd = socket(AF_INET, SOCK_STREAM, 0); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
115 if (-1 == sockfd) perror_exit("socket"); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
116 fcntl(sockfd, F_SETFD, FD_CLOEXEC); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
117 temp = 1; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
118 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp)); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
119 memset(&address, 0, sizeof(address)); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
120 address.sin_family = AF_INET; |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
121 if (TT.source_address || TT.port) { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
122 address.sin_port = SWAP_BE16(TT.port); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
123 if (TT.source_address) |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
124 lookup_name(TT.source_address, (uint32_t *)&address.sin_addr); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
125 if (bind(sockfd, &address, sizeof(address))) |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
126 perror_exit("bind"); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
127 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
128 |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
129 // Dial out |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
130 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
131 if (!CFG_NETCAT_LISTEN || !(toys.optflags&(FLAG_L|FLAG_l))) { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
132 // Figure out where to dial out to. |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
133 lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
134 lookup_port(toys.optargs[1], &address.sin_port); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
135 temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address)); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
136 if (temp<0) perror_exit("connect"); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
137 pollfds[0].fd = sockfd; |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
138 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
139 // Listen for incoming connections |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
140 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
141 } else { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
142 socklen_t len = sizeof(address); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
143 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
144 if (listen(sockfd, 5)) error_exit("listen"); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
145 if (!TT.port) { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
146 getsockname(sockfd, &address, &len); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
147 printf("%d\n", SWAP_BE16(address.sin_port)); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
148 fflush(stdout); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
149 } |
322
fa0a95ae4303
Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents:
321
diff
changeset
|
150 // Do we need to return immediately because -l has arguments? |
fa0a95ae4303
Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents:
321
diff
changeset
|
151 |
323
dd0b130edf6d
Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents:
322
diff
changeset
|
152 if ((toys.optflags&FLAG_l) && toys.optc) { |
322
fa0a95ae4303
Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents:
321
diff
changeset
|
153 if (fork()) goto cleanup; |
323
dd0b130edf6d
Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents:
322
diff
changeset
|
154 close(0); |
dd0b130edf6d
Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents:
322
diff
changeset
|
155 close(1); |
dd0b130edf6d
Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents:
322
diff
changeset
|
156 close(2); |
dd0b130edf6d
Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents:
322
diff
changeset
|
157 } |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
158 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
159 for (;;) { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
160 pid_t child = 0; |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
161 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
162 // For -l, call accept from the _new_ thread. |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
163 |
322
fa0a95ae4303
Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents:
321
diff
changeset
|
164 pollfds[0].fd = accept(sockfd, (struct sockaddr *)&address, |
fa0a95ae4303
Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents:
321
diff
changeset
|
165 &len); |
fa0a95ae4303
Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents:
321
diff
changeset
|
166 if (pollfds[0].fd<0) perror_exit("accept"); |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
167 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
168 // Do we need a tty? |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
169 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
170 if (toys.optflags&FLAG_t) |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
171 child = forkpty(&(pollfds[1].fd), NULL, NULL, NULL); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
172 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
173 // Do we need to fork and/or redirect for exec? |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
174 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
175 else { |
322
fa0a95ae4303
Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents:
321
diff
changeset
|
176 if (toys.optflags&FLAG_L) child = fork(); |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
177 if (!child && toys.optc) { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
178 int fd = pollfds[0].fd; |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
179 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
180 if (!temp) close(sockfd); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
181 dup2(fd, 0); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
182 dup2(fd, 1); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
183 dup2(fd, 2); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
184 if (fd>2) close(fd); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
185 } |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
186 } |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
187 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
188 if (child<0) error_msg("Fork failed\n"); |
322
fa0a95ae4303
Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents:
321
diff
changeset
|
189 if (child<1) break; |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
190 close(pollfds[0].fd); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
191 } |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
192 } |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
193 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
194 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
195 // We have a connection. Disarm timeout. |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
196 // (Does not play well with -L, but what _should_ that do?) |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
197 set_alarm(0); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
198 |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
199 if (CFG_NETCAT_LISTEN && (toys.optflags&(FLAG_L|FLAG_l) && toys.optc)) { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
200 execvp(*toys.optargs, toys.optargs); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
201 error_exit("Exec failed"); |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
202 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
203 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
204 // Poll loop copying stdin->socket and socket->stdout. |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
205 for (;;) { |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
206 int i; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
207 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
208 if (0>poll(pollfds, pollcount, -1)) perror_exit("poll"); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
209 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
210 for (i=0; i<pollcount; i++) { |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
211 if (pollfds[i].revents & POLLIN) { |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
212 int len = read(pollfds[i].fd, toybuf, sizeof(toybuf)); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
213 if (len<1) goto dohupnow; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
214 xwrite(i ? pollfds[0].fd : 1, toybuf, len); |
324
50c8afc263ee
More than 4k of input can be queued up in a pipe, so loop needs to continue reading until POLLIN is exhausted before acknowledging POLLHUP.
Rob Landley <rob@landley.net>
parents:
323
diff
changeset
|
215 } else if (pollfds[i].revents & POLLHUP) { |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
216 dohupnow: |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
217 // Close half-connection. This is needed for things like |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
218 // "echo GET / | netcat landley.net 80" |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
219 if (i) { |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
220 shutdown(pollfds[0].fd, SHUT_WR); |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
221 pollcount--; |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
222 set_alarm(TT.quit_delay); |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
223 } else goto cleanup; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
224 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
225 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
226 } |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
227 cleanup: |
321
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
228 if (CFG_TOYBOX_FREE) { |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
229 close(pollfds[0].fd); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
230 close(sockfd); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents:
237
diff
changeset
|
231 } |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff
changeset
|
232 } |